CN112599099B - Pixel driving circuit and pixel driving method thereof - Google Patents
Pixel driving circuit and pixel driving method thereof Download PDFInfo
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- CN112599099B CN112599099B CN202011515922.8A CN202011515922A CN112599099B CN 112599099 B CN112599099 B CN 112599099B CN 202011515922 A CN202011515922 A CN 202011515922A CN 112599099 B CN112599099 B CN 112599099B
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
- G09G3/3225—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
- G09G3/3225—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
- G09G3/3258—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix with pixel circuitry controlling the voltage across the light-emitting element
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0242—Compensation of deficiencies in the appearance of colours
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
- Control Of El Displays (AREA)
- Electroluminescent Light Sources (AREA)
Abstract
The invention provides a pixel driving circuit and a pixel driving method thereof. The pixel driving circuit includes: a first reset sub-circuit configured to respond to a first reset control signal and reset a voltage of a control terminal of the driving sub-circuit by a first initialization signal; a data write sub-circuit configured to transmit a data voltage signal to a first terminal of the driving sub-circuit in response to a first scan signal; a threshold compensation sub-circuit configured to compensate for a threshold voltage of the driving sub-circuit in response to the second scan signal; a storage sub-circuit configured to store a data voltage signal; a driving sub-circuit configured to provide a driving current to the light emitting device according to voltages of a first terminal and a control terminal thereof; the current compensation sub-circuit is configured to respond to the third scanning signal and provide compensation driving current for the light-emitting device according to the temperature control signal when the temperature is lower than the normal temperature. The pixel driving circuit can maintain the stable white balance of the display picture at low temperature.
Description
Technical Field
The invention belongs to the technical field of display, and particularly relates to a pixel driving circuit and a pixel driving method thereof.
Background
OLED (organic light emitting diode) display products have become mainstream in the market due to their advantages of wide color gamut, high resolution, high contrast, low power consumption, flexibility, etc. With the wider and wider application range of the OLED display products, the OLED display products are required to have better stability in display under different environments.
When an AMOLED (Active-matrix organic light emitting diode) display panel is tested for low-temperature reliability, the carrier mobility of the light emitting material is reduced along with the reduction of temperature, the turn-on voltage of the light emitting material is increased, and the light emitting efficiency is correspondingly reduced. At this time, the intensity of the RGB (red, green, blue) monochromatic light emitted by the OLED light emitting device excited by the saturation current provided by the switching MOS transistor is correspondingly reduced. Due to the fact that the brightness attenuation proportion of the RGB single-color light-emitting elements is different due to different increasing amounts of the starting voltage of the RGB single-color light-emitting elements when the temperature is reduced, white light matched by the whole display panel is yellow or green, and the display effect is seriously affected.
Disclosure of Invention
The invention provides a pixel driving circuit and a pixel driving method thereof, aiming at the problem that white light display is yellow or green due to different brightness attenuation of single-color OLED light-emitting elements caused by temperature reduction. The pixel driving circuit is provided with the current compensation sub-circuit, when the ambient temperature is lower than the normal temperature, the current compensation sub-circuit can provide compensation driving current for the light-emitting devices, so that the light-emitting intensity of the light-emitting devices with different colors is consistent with or has a small difference with the light-emitting intensity at the normal temperature, the front-view color difference between the light-emitting devices with different colors when the ambient temperature is lower than the normal temperature is reduced, and the white balance stability of a display picture at the low temperature is maintained.
The present invention provides a pixel driving circuit, including: the circuit comprises a first reset sub-circuit, a data writing sub-circuit, a threshold compensation sub-circuit, a driving sub-circuit and a storage sub-circuit; wherein the content of the first and second substances,
the first reset sub-circuit is configured to respond to a first reset control signal and reset the voltage of the control end of the driving sub-circuit through a first initialization signal;
the data writing sub-circuit is configured to respond to a first scanning signal and transmit a data voltage signal to a first end of the driving sub-circuit;
the threshold compensation sub-circuit configured to compensate for a threshold voltage of the driving sub-circuit in response to a second scan signal;
the storage sub-circuit configured to store the data voltage signal;
the driving sub-circuit is configured to provide a driving current for the light-emitting device according to voltages of a first terminal and a control terminal thereof;
the current compensation sub-circuit is configured to respond to a third scanning signal and provide a compensation driving current for the light-emitting device according to a temperature control signal when the temperature is lower than the normal temperature.
Optionally, the current compensation sub-circuit comprises an eighth transistor, and a control electrode of the eighth transistor is connected to the third scanning signal line; a first electrode of the eighth transistor is connected to a first electrode of the light emitting device; and the second pole of the eighth transistor is connected with a temperature control signal end.
Optionally, the temperature control signal includes a potential difference between the first pole and the second pole of the corresponding eighth transistor at a saturation current when the light emitting device emits light with a set light intensity at different temperatures.
Optionally, the temperature control signal further includes a potential difference between the first pole and the second pole of the corresponding eighth transistor under a saturation current when the light emitting device emits light with a set light intensity under different data voltage signals.
Optionally, the light emitting devices include a light emitting device of a specific color and a light emitting device of other colors, and at different temperatures, the light intensity variation of the light emitted by the light emitting device of the specific color is greater than the light intensity variation of the light emitted by the light emitting device of other colors;
a first electrode of the eighth transistor is connected to the first electrode of the specific-color light emitting device.
Optionally, the lighting circuit further comprises a first lighting control sub-circuit, a second lighting control sub-circuit and a second reset sub-circuit;
the first light emission control sub-circuit configured to control whether a first reference voltage can be written to a first terminal of the driving sub-circuit in response to a first light emission control signal;
the second light emission control sub-circuit configured to turn on or off a connection between the driving sub-circuit and the light emitting device in response to a second light emission control signal;
the second reset sub-circuit is configured to initialize the light emitting device by a second initialization signal in response to a second reset control signal.
Optionally, the first reset sub-circuit comprises a first transistor; the driving sub-circuit includes a third transistor; the data write sub-circuit includes a fourth transistor; the threshold compensation sub-circuit comprises a second transistor; the storage sub-circuit comprises a storage capacitor;
a first pole of the first transistor is connected with a first initialization signal end, a second pole of the first transistor is connected with a control pole of the third transistor, and the control pole of the first transistor is connected with the first reset control signal line;
a control electrode of the third transistor is connected with the second polar plate of the storage capacitor, a first electrode of the third transistor is connected with a second electrode of the fourth transistor, and a second electrode of the third transistor is connected with a second electrode of the second transistor;
the first pole plate of the storage capacitor is connected with a first power supply end; a control electrode of the fourth transistor is connected with a first scanning signal line, and a first electrode of the fourth transistor is connected with a data signal line; the control electrode of the second transistor is connected with a second scanning signal line, and the first electrode of the second transistor is connected with the second polar plate of the storage capacitor;
the first light emitting control sub-circuit includes a fifth transistor;
a first electrode of the fifth transistor is connected with the first power supply end, a second electrode of the fifth transistor is connected with a first electrode of the third transistor, and a control electrode of the fifth transistor is connected with a first light-emitting control line;
the second light emission control sub-circuit includes a sixth transistor;
a first electrode of the sixth transistor is connected to the second electrode of the third transistor, a second electrode of the sixth transistor is connected to the first electrode of the light emitting device, and a control electrode of the sixth transistor is connected to a second light emission control line;
the second reset sub-circuit comprises a seventh transistor;
a first electrode of the seventh transistor is connected with a first electrode of the light-emitting device, a second electrode of the seventh transistor is connected with a second initialization signal end, and a control electrode of the seventh transistor is connected with a second reset control signal line; the second electrode of the light-emitting device is connected with a second power supply end.
Optionally, the eighth transistor is connected between the seventh transistor and the light emitting device;
alternatively, the eighth transistor is connected between the sixth transistor and the seventh transistor.
The invention also provides a pixel driving method of the pixel driving circuit, which comprises the following steps:
an initialization stage, responding to a first reset control signal, and resetting the voltage of the control end of the driving sub-circuit through the first initialization signal;
a data writing stage, responding to a first scanning signal, transmitting a data voltage signal to a first end of a driving sub-circuit, responding to a second scanning signal, compensating the threshold voltage of the driving sub-circuit, and storing the data voltage signal;
a light emitting stage for providing a driving current for the light emitting device according to the voltages of the first end and the control end;
further comprising: and in the light-emitting stage, responding to a third scanning signal, and providing a compensation driving current for the light-emitting device according to a temperature control signal.
Optionally, the method further comprises: establishing and storing a first mapping relation table and/or a second mapping relation table;
in the light emitting stage, sensing the external environment temperature, and searching the corresponding temperature control signal from the first mapping relation table and/or the second mapping relation table according to the external environment temperature;
providing the searched temperature control signal to an eighth transistor;
the first mapping relation table is a mapping relation between different temperatures and potential differences between a first pole and a second pole of the corresponding eighth transistor under saturation current when the light-emitting device emits light with set light intensity at different temperatures;
the second mapping relation table is a mapping relation between different data voltage signals and a potential difference between the first pole and the second pole of the corresponding eighth transistor under the saturation current when the light emitting device emits light with set light intensity under different data voltage signals.
The invention has the beneficial effects that: the pixel driving circuit provided by the invention has the advantages that by arranging the current compensation sub-circuit, when the ambient temperature is lower than the normal temperature, the current compensation sub-circuit can provide compensation driving current for the light-emitting devices, so that the light-emitting intensities of the light-emitting devices with different colors are consistent with or have small difference with the light-emitting intensity at the normal temperature, the front-view color difference between the light-emitting devices with different colors when the ambient temperature is lower than the normal temperature is reduced, and the white balance of a display picture at low temperature is kept stable.
Drawings
FIG. 1 is a diagram illustrating the correspondence between the turn-on voltage and the luminance of OLED light-emitting devices with different colors at different temperatures;
fig. 2 is a circuit diagram of a 7T1C pixel in the prior art;
FIG. 3 is a timing diagram of the driving of the pixel circuit of FIG. 2;
FIG. 4 is a graph of voltage mapping for three different node locations in FIG. 2 at various timing stages in FIG. 3;
FIG. 5 is a circuit diagram of a pixel driving circuit according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of temperature control signals correspondingly provided to an eighth transistor at different temperatures;
FIG. 7 is a schematic diagram of temperature control signals correspondingly provided to an eighth transistor under different data voltage signals at the same temperature;
FIG. 8 is a diagram illustrating a mapping relationship between temperature control signals provided to an eighth transistor according to different temperatures and different data voltage signals;
FIG. 9 is a circuit diagram of another pixel driving circuit according to an embodiment of the present invention;
FIG. 10 is a driving timing diagram of the pixel driving circuit according to the embodiment of the invention.
Wherein the reference numerals are:
1. a first reset sub-circuit; 2. a data write sub-circuit; 3. a threshold compensation sub-circuit; 4. a drive sub-circuit; 5. a storage sub-circuit; 6. a current compensation sub-circuit; 7. a first light emitting control sub-circuit; 8. a second light emission control sub-circuit; 9. a second reset sub-circuit.
Detailed Description
In order to make the technical solutions of the present invention better understood by those skilled in the art, a pixel driving circuit and a pixel driving method thereof according to the present invention are described in further detail below with reference to the accompanying drawings and the detailed description.
Fig. 1 is a graph showing the relationship between the turn-on voltage and the luminance of the OLED light-emitting devices of different colors at different temperatures, where the turn-on voltage of the light-emitting devices changes at different temperatures. When the temperature decreases, the carrier mobility rate of the OLED light emitting element decreases, resulting in an increase in the turn-on voltage of the OLED light emitting element. Meanwhile, the voltage variation of the OLED light emitting elements with different colors (such as RGB light emitting elements, i.e., red, green, and blue OLED light emitting elements) is different, and the reduction of the light emitting intensity of the OLED light emitting elements with different colors is not proportional, so that the white light emitted by the OLED light emitting elements with different colors in the OLED display panel at low temperature is not consistent with that at normal temperature. If the voltage variation of the red OLED light-emitting element is large, the OLED display panel displays a white picture which is slightly cyan at low temperature; if the voltage variation of the blue OLED light-emitting element is large, the OLED display panel displays a yellow white screen at low temperature, and the white balance is lost.
Fig. 2 shows a 7T1C pixel circuit in the prior art, wherein T1, T2, T4, T5, T6 and T7 are switching transistors (STFT); t3 is a drive transistor (DTFT); cst is a storage capacitor; reset is a Reset pulse signal, Gate is a scanning pulse signal, EM is an enable pulse signal, and Vdata is a data pulse signal; VDD, Vinit, VSS are all DC voltage signals. Fig. 3 is a timing diagram of the pixel circuit in fig. 2 driving the OLED light emitting element to emit light. FIG. 4 is a graph of the voltages at three different node locations in FIG. 2 at various timing stages. In the pixel circuit shown in fig. 2, at a low temperature, the saturation current of the driving transistor is not changed, the turn-on voltage of the OLED light emitting element is increased, the current efficiency is reduced, and the light emission luminance is reduced. The reduction ratios of the luminance of the red, green and blue OLED light-emitting elements are inconsistent, which causes the white point display color coordinate to shift and the white balance to be destroyed.
An embodiment of the present invention provides a pixel driving circuit, as shown in fig. 5, including: a first reset sub-circuit 1, a data write sub-circuit 2, a threshold compensation sub-circuit 3, a drive sub-circuit 4, and a storage sub-circuit 5; wherein, the first Reset sub-circuit 1 is configured to respond to the first Reset control signal Reset and Reset the voltage of the control terminal of the driving sub-circuit 4 by the first initialization signal; a data writing sub-circuit 2 configured to transmit a data voltage signal Vdata to a first terminal of the driving sub-circuit 4 in response to a first scan signal; a threshold compensation sub-circuit 3 configured to compensate for a threshold voltage of the driving sub-circuit 4 in response to the second scan signal; a storage sub-circuit 5 configured to store the data voltage signal Vdata; a driving sub-circuit 4 configured to supply a driving current to the light emitting device D according to voltages of a first terminal and a control terminal thereof; and a current compensation sub-circuit 6 configured to provide a compensation driving current to the light emitting device D according to the temperature control signal Vsup at a time lower than the normal temperature in response to the third scan signal Gate 2.
The same scanning signal Gate is adopted for the first scanning signal and the second scanning signal. The first initialization signal adopts an initialization signal Vinit.
The pixel driving circuit is provided with the current compensation sub-circuit 6, when the ambient temperature is lower than the normal temperature, the current compensation sub-circuit 6 can provide compensation driving current for the light-emitting device D, so that the light-emitting intensity of the light-emitting devices D with different colors is consistent with or has a small difference with the light-emitting intensity at the normal temperature, the front-view color difference between the light-emitting devices D with different colors when the ambient temperature is lower than the normal temperature is reduced, and the white balance of a display picture at the low temperature is kept stable. Wherein the normal temperature is 25 ℃.
In this embodiment, the current compensation sub-circuit 6 includes an eighth transistor T8, a control electrode of the eighth transistor T8 is connected to the third scan signal line Gate 2; a first electrode of the eighth transistor T8 is connected to the first electrode of the light emitting device D; a second pole of the eighth transistor T8 is connected to the temperature control signal terminal. Wherein the temperature control signal terminal provides a temperature control signal Vsup.
Alternatively, the temperature control signal Vsup includes a potential difference between the first and second poles of the corresponding eighth transistor T8 at a saturation current when the light emitting device D emits light of a set light intensity at different temperatures.
In order to control the compensation driving current value output by the eighth transistor T8 at different temperatures lower than the normal temperature, the variation relationship of the driving current with the temperature when the monochromatic light emitting device D emits a fixed light intensity is collected, the driving current value which ensures that the light intensity of the light emitting device D does not change and needs to be compensated at different temperatures lower than the normal temperature is calculated, and the mapping relationship between the potential difference between the first electrode and the second electrode of the eighth transistor T8 and the saturation current Id of the eighth transistor T8 at different temperatures lower than the normal temperature (such as T1 temperature and T2 temperature … Tn temperature) as shown in fig. 6 is obtained; in the mapping relationship, the saturation current Id of the eighth transistor T8 at different temperatures is the compensation driving current value provided to the light emitting device D at different temperatures; the temperature control signal Vsup supplied to the eighth transistor T8 at different temperatures is a potential difference between the first pole and the second pole of the eighth transistor T8 at different temperatures.
Further optionally, the temperature control signal Vsup further includes a potential difference between the first and second electrodes of the corresponding eighth transistor T8 at the saturation current Id when the light emitting device D emits light of a set light intensity under different data voltage signals Vdata.
Under the same temperature (such as T1 temperature) lower than the normal temperature, because the driving currents of the light emitting device D needing to be compensated for ensuring the same luminous intensity under different data voltage signals Vdata (such as Vdata-1 and Vdata-2 … Vdata-n) are different, under the same temperature lower than the normal temperature, the difference value of the driving current of the light emitting device D under the low temperature and the driving current of the light emitting device D under the normal temperature under the same temperature is collected and recorded, and the mapping relation between the potential difference between the first pole and the second pole of the eighth transistor T8 and the saturation current Id of the eighth transistor T8 under different data voltage signals Vdata is obtained, as shown in FIG. 7; in the mapping relationship, the saturation current Id of the eighth transistor T8 at the same low temperature is the compensation driving current value provided to the light emitting device D under different data voltage signals Vdata; the temperature control signal Vsup provided to the eighth transistor T8 under the different data voltage signals Vdata is a potential difference between the first and second poles of the eighth transistor T8 under the different data voltage signals Vdata.
In the present embodiment, as shown in fig. 8, the temperature control signal Vsup is the sum of the potential difference between the first and second electrodes of the corresponding eighth transistor T8 at the saturation current when the light emitting device D emits light of the set light intensity at different temperatures and the potential difference between the first and second electrodes of the corresponding eighth transistor T8 at the saturation current when the light emitting device D emits light of the set light intensity at different data voltage signals Vdata. Namely, the two mapping relationships are made into a lookup table (as shown in fig. 8) and are burned into the pixel driving chip, the temperature sensor provides a temperature feedback value to the pixel driving chip, and the pixel driving chip responds to the temperature feedback and controls the eighth transistor T8 to provide the value of the temperature control signal Vsup of the eighth transistor T8 under different data voltage signals Vdata at different temperatures lower than the normal temperature. The saturation current of the eighth transistor T8 is used to compensate for the decrease in the intensity of the light emitted from the light emitting device D at a temperature lower than the normal temperature. Therefore, the difference of the luminous intensity of the light-emitting devices D with different colors at low temperature and normal temperature can be further reduced, and the white balance of the display picture at low temperature is better maintained to be stable.
Optionally, the light emitting device D includes a light emitting device of a specific color and light emitting devices of other colors, and at different temperatures, the light intensity variation of light emitted by the light emitting device of the specific color is greater than the light intensity variation of light emitted by the light emitting devices of other colors; a first electrode of the eighth transistor T8 is connected to the first electrode of the specific-color light emitting device. The light emitting device of a specific color may be a light emitting device of a certain color or a certain number of colors. The driving current compensation can be carried out only for the specific color light-emitting device with the maximum or large light intensity change at different temperatures, so that the difference between the light intensity of the specific color light-emitting device and the light intensity of other color light-emitting devices at low temperature and normal temperature is reduced, and the white balance stability of a display picture at low temperature is better maintained.
In this example, see the figureAs shown in fig. 5, the pixel driving circuit further includes a first light-emitting control sub-circuit 7, a second light-emitting control sub-circuit 8, and a second reset sub-circuit 9; a first light emission control sub-circuit 7 configured to control the first reference voltage V in response to a first light emission control signalDDWhether it can be written to the first terminal of the drive sub-circuit 4; a second light emission control sub-circuit 8 configured to turn on or off a connection between the driving sub-circuit 4 and the light emitting device D in response to a second light emission control signal; and a second reset sub-circuit 9 configured to initialize the light emitting device D by a second initialization signal in response to a second reset control signal.
The first light-emitting control signal and the second light-emitting control signal adopt the same light-emitting control signal EM. The second Reset control signal employs a Reset control signal Reset. The second initialization signal adopts an initialization signal Vinit.
Optionally, the first reset sub-circuit 1 includes a first transistor T1; the driving sub-circuit 4 includes a third transistor T3; the data writing sub-circuit 2 includes a fourth transistor T4; the threshold compensation sub-circuit 3 includes a second transistor T2; the storage sub-circuit 5 includes a storage capacitor Cst; a first electrode of the first transistor T1 is connected to the first initialization signal terminal, a second electrode of the first transistor T1 is connected to a control electrode of the third transistor T3, and a control electrode of the first transistor T1 is connected to the first reset control signal line; a control electrode of the third transistor T3 is coupled to the second plate of the storage capacitor Cst, a first electrode of the third transistor T3 is coupled to the second electrode of the fourth transistor T4, and a second electrode of the third transistor T3 is coupled to the second electrode of the second transistor T2; a first plate of the storage capacitor Cst is connected to a first power terminal; a control electrode of the fourth transistor T4 is connected to the first scan signal line, and a first electrode of the fourth transistor T4 is connected to the data signal line; a control electrode of the second transistor T2 is a second scan signal line, and a first electrode of the second transistor T2 is connected to the second plate of the storage capacitor Cst; the first light emission control sub-circuit 7 includes a fifth transistor T5; a first electrode of the fifth transistor T5 is connected to a first power source terminal, a second electrode of the fifth transistor T5 is connected to a first electrode of the third transistor T3, and a control electrode of the fifth transistor T5 is connected to a first light emission control line; the second light emission control sub-circuit 8 includes a sixth transistor T6; a first electrode of the sixth transistor T6 is connected to the second electrode of the third transistor T3, a second electrode of the sixth transistor T6 is connected to the first electrode of the light emitting device D, and a control electrode of the sixth transistor T6 is connected to the second light emission control line; the second reset sub-circuit 9 includes a seventh transistor T7; a first electrode of the seventh transistor T7 is connected to the first electrode of the light emitting device D, a second electrode of the seventh transistor T7 is connected to the second initialization signal terminal, and a control electrode of the seventh transistor T7 is connected to the second reset control signal line; the second electrode of the light emitting device D is connected to a second power source terminal.
Wherein the first power supply terminal provides a first reference voltage VDDAnd the second power supply terminal supplies a second reference voltage Vss. The first and second emission control lines respectively supply emission control signals EM. The first scanning signal line and the second scanning signal line respectively provide scanning signals Gate. The second Reset control signal line provides a Reset control signal Reset. The first initialization signal terminal and the second initialization signal terminal respectively provide an initialization signal Vinit.
It should be noted that, according to the characteristics of the transistors, the transistors may be divided into N-type transistors and P-type transistors, and the transistors in this embodiment are P-type transistors (for example, P-type MOS transistors), that is, the first transistor T1, the second transistor T2, the third transistor T3, the fourth transistor T4, the fifth transistor T5, the sixth transistor T6, the seventh transistor T7, and the eighth transistor T8 are all P-type transistors. However, the transistors of the present embodiment are not limited to P-type transistors, and those skilled in the art may also implement the functions of one or more transistors in the present embodiment by using N-type transistors (e.g., N-type MOS transistors) according to actual needs.
In addition, the transistor used in this embodiment may be a thin film transistor or a field effect transistor or other switching devices with the same characteristics, and the thin film transistor may include an oxide semiconductor thin film transistor, an amorphous silicon thin film transistor, a polysilicon thin film transistor, or the like. Each transistor comprises a first pole, a second pole and a control pole; the control electrode is used as a grid electrode of the transistor, one of the first electrode and the second electrode is used as a source electrode of the transistor, and the other electrode is used as a drain electrode of the transistor; the source and drain of the transistor may be symmetrical in structure, so that there may be no difference in physical structure. The sources and drains of all or some of the transistors in this embodiment may be interchanged as desired.
A first reference voltage VDDAnd one of the second reference voltages Vss is a high-voltage terminal and the other is a low-voltage terminal. In this embodiment, the first reference voltage VDDIs a positive voltage; the second reference voltage Vss is a negative voltage. The second reference voltage Vss may be a ground voltage.
The Light Emitting device D may be a Micro inorganic Light Emitting Diode, and further may be a current type Light Emitting Diode, such as a Micro Light Emitting Diode (Micro LED) or a Mini Light Emitting Diode (Mini LED), and of course, the Light Emitting device D in the embodiment of the present invention may also be an Organic Light Emitting Diode (OLED). One of the first electrode and the second electrode of the light-emitting device D is an anode, and the other is a cathode; in the embodiment of the present invention, the first electrode of the light emitting device D is taken as an anode, and the second electrode is taken as a cathode.
In the present embodiment, the eighth transistor T8 is connected between the seventh transistor T7 and the light emitting device D.
As shown in fig. 9, the eighth transistor T8 may be connected between the sixth transistor T6 and the seventh transistor T7.
Based on the above circuit structure of the pixel driving circuit, the present embodiment further provides a pixel driving method of the pixel driving circuit, including: an initialization stage, responding to a first reset control signal, and resetting the voltage of the control end of the driving sub-circuit through the first initialization signal;
a data writing stage, responding to a first scanning signal, transmitting a data voltage signal to a first end of the driving sub-circuit, responding to a second scanning signal, compensating the threshold voltage of the driving sub-circuit, and simultaneously storing the data voltage signal;
a light emitting stage for providing a driving current for the light emitting device according to the voltages of the first end and the control end;
the pixel driving method further includes: and in the light-emitting stage, responding to the third scanning signal, and providing a compensation driving current for the light-emitting device according to the temperature control signal.
As shown in fig. 5, 9 and 10, in the initialization stage (i), the Reset control signal Reset is a low level signal, and the scan signal Gate and the emission control signal EM are high level signals; the first transistor T1 and the seventh transistor T7 are turned on, and the gate of the third transistor T3 is written with the initialization signal Vinit by the first initialization signal terminal in preparation for the writing of the voltage signal Vdata of the next frame data. An initialization voltage (Vinit is less than or equal to VSS) is written into the anode of the light emitting device D through the seventh transistor T7, so that the light emitting device D is no longer in a forward conduction state, and an internal electric field formed by directional movement of impurity ions in the light emitting device D gradually disappears, thereby recovering the characteristics of the light emitting device D.
In the data writing stage two: the scanning signal Gate is a low level signal, and the Reset control signal Reset and the light-emitting control signal EM are high level signals; the fourth transistor T4 and the second transistor T2 are turned on. The third transistor T3 is connected by the second transistor T2 to form a diode structure, and the data voltage signal Vdata is written to the gate of the third transistor T3 through the fourth transistor T4 and the second transistor T2 until the third transistor T3 is turned off. The gate voltage of the third transistor T3 is Vdata + Vth (Vth)<0, Vth is a threshold voltage of the third transistor T3) and is stored in the storage capacitor Cst. The voltages of the first and second plates of the storage capacitor Cst are VDDAnd Vdata + Vth.
In the emission stage c, the emission control signal EM is a low level signal, the scan signal Gate and the Reset control signal Reset are high level signals, the fifth transistor T5 and the sixth transistor T6 are both turned on, the source of the third transistor T3 is connected to the first power source terminal, and the source voltage of the third transistor T3 is instantaneously changed from Vdata in the previous stage to VDD. The light emitting device D emits light when driven by the third transistor T3, the third transistor T3 operates in a saturation region, a gate voltage of the third transistor T3 is Vdata + Vth, and a source voltage of the third transistor T3 is VDDTherefore, the gate-source voltage of the third transistor T3Comprises the following steps: vgs (Vdata + Vth) -VDDUntil the reset phase of the next frame.
The light emitting current of the light emitting device D is equal to the current flowing through the third transistor T3, and its expression is as follows:
ID＝β(Vgs-Vth)2
＝β(Vdata+Vth-VDD-Vth)2
＝β(Vdata-VDD)2；
wherein the content of the first and second substances,
μnis the electron mobility, C, of the third transistor T3oxIs an insulation capacitance per unit area,
is the width-to-length ratio of the third transistor T3.
Meanwhile, in the third light emitting stage, the third scan signal Gate2 is a low level signal, the eighth transistor T8 is turned on, the temperature control signal Vsup is provided to the source of the eighth transistor T8 by the pixel driving chip, and the saturation current of the eighth transistor T8 is the compensation driving current provided to the light emitting device D.
The process of compensating the driving current of the light emitting device in the specific light emitting stage is to introduce a temperature sensor into the pixel driving chip, and to control the timing sequence of the third scanning signal Gate2 at normal temperature and low temperature according to the external temperature sensing value of the temperature sensor. At normal temperature, the third scanning signal Gate2 keeps high level all the time, the eighth transistor T8 keeps off state all the time, and the current compensation mechanism is not started; when the temperature is reduced to be lower than the normal temperature, the pixel driving chip converts the time sequence of the third scanning signal Gate2 to be consistent with the time sequence of the light-emitting control signal EM, that is, in the light-emitting stage, the sixth transistor T6 is turned on, and the eighth transistor T8 is also turned on to perform driving current compensation; in other phases, the sixth transistor T6 is turned off, and the eighth transistor T8 is also turned off, which does not affect the seventh transistor T7 to turn on the reset signal in the next phase.
The pixel driving method in this embodiment further includes: establishing and storing a first mapping relation table and/or a second mapping relation table; in the light emitting stage, sensing the external environment temperature, and searching a corresponding temperature control signal from the first mapping relation table and/or the second mapping relation table according to the external environment temperature; the searched temperature control signal is supplied to the eighth transistor. The first mapping relation table is a mapping relation between different temperatures and potential differences between the first pole and the second pole of the corresponding eighth transistor under saturation current when the light emitting device emits light with set light intensity at different temperatures; the second mapping relation table is a mapping relation between different data voltage signals and a potential difference between the first pole and the second pole of the corresponding eighth transistor under the saturation current when the light emitting device emits light with set light intensity under different data voltage signals.
The pixel driving circuit provided by the embodiment is provided with the current compensation sub-circuit, and when the ambient temperature is lower than the normal temperature, the current compensation sub-circuit can provide compensation driving current for the light emitting devices, so that the light emitting intensities of the light emitting devices with different colors are kept consistent with or have small difference with the light emitting intensity at the normal temperature, the front-view color difference between the light emitting devices with different colors when the ambient temperature is lower than the normal temperature is reduced, and the white balance of a display picture at a low temperature is maintained to be stable.
The embodiment of the invention also provides a display device which comprises the pixel driving circuit in the embodiment.
By adopting the pixel driving circuit, the picture display effect of the display device is improved.
The display device provided by the embodiment of the invention can be any product or component with a display function, such as an OLED panel, an OLED television, a Micro LED panel, a Mini LED panel, a display, a mobile phone, a navigator and the like.
It will be understood that the above embodiments are merely exemplary embodiments taken to illustrate the principles of the present invention, which is not limited thereto. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit and substance of the invention, and these modifications and improvements are also considered to be within the scope of the invention.
Claims (6)
1. A pixel driving circuit comprising: the circuit comprises a first reset sub-circuit, a data writing sub-circuit, a threshold compensation sub-circuit, a driving sub-circuit and a storage sub-circuit; wherein the content of the first and second substances,
the first reset sub-circuit is configured to respond to a first reset control signal and reset the voltage of the control end of the driving sub-circuit through a first initialization signal;
the data writing sub-circuit is configured to respond to a first scanning signal and transmit a data voltage signal to a first end of the driving sub-circuit;
the threshold compensation sub-circuit configured to compensate for a threshold voltage of the driving sub-circuit in response to a second scan signal;
the storage sub-circuit configured to store the data voltage signal;
the driving sub-circuit is configured to provide a driving current for the light-emitting device according to voltages of a first terminal and a control terminal thereof;
the light-emitting device is characterized by further comprising a current compensation sub-circuit which is configured to respond to a third scanning signal and provide a compensation driving current for the light-emitting device according to a temperature control signal when the temperature is lower than the normal temperature;
the current compensation sub-circuit comprises an eighth transistor, and a control electrode of the eighth transistor is connected with the third scanning signal line; a first electrode of the eighth transistor is connected to a first electrode of the light emitting device; a second pole of the eighth transistor is connected with a temperature control signal end;
the temperature control signal comprises a potential difference between a first pole and a second pole of the corresponding eighth transistor under saturation current when the light emitting device emits light with set light intensity at different temperatures;
the temperature control signal further includes a potential difference between the first pole and the second pole of the corresponding eighth transistor under the saturation current when the light emitting device emits light with set light intensity under different data voltage signals.
2. The pixel driving circuit according to claim 1, wherein the light emitting devices include a specific color light emitting device and other color light emitting devices, and a change in intensity of light emitted from the specific color light emitting device is larger than a change in intensity of light emitted from the other color light emitting devices at different temperatures; the light emitting device of the specific color comprises one or more light emitting devices of red, green and blue colors;
a first electrode of the eighth transistor is connected to the first electrode of the specific-color light emitting device.
3. The pixel driving circuit according to claim 2, further comprising a first emission control sub-circuit, a second emission control sub-circuit, and a second reset sub-circuit;
the first light emission control sub-circuit configured to control whether a first reference voltage can be written to a first terminal of the driving sub-circuit in response to a first light emission control signal;
the second light emission control sub-circuit configured to turn on or off a connection between the driving sub-circuit and the light emitting device in response to a second light emission control signal;
the second reset sub-circuit is configured to initialize the light emitting device by a second initialization signal in response to a second reset control signal.
4. The pixel driving circuit according to claim 3, wherein the first reset sub-circuit comprises a first transistor; the driving sub-circuit includes a third transistor; the data write sub-circuit includes a fourth transistor; the threshold compensation sub-circuit comprises a second transistor; the storage sub-circuit comprises a storage capacitor;
a first pole of the first transistor is connected with a first initialization signal end, a second pole of the first transistor is connected with a control pole of the third transistor, and the control pole of the first transistor is connected with the first reset control signal line;
a control electrode of the third transistor is connected with the second polar plate of the storage capacitor, a first electrode of the third transistor is connected with a second electrode of the fourth transistor, and a second electrode of the third transistor is connected with a second electrode of the second transistor;
the first pole plate of the storage capacitor is connected with a first power supply end; a control electrode of the fourth transistor is connected with a first scanning signal line, and a first electrode of the fourth transistor is connected with a data signal line; the control electrode of the second transistor is connected with a second scanning signal line, and the first electrode of the second transistor is connected with the second polar plate of the storage capacitor;
the first light emitting control sub-circuit includes a fifth transistor;
a first electrode of the fifth transistor is connected with the first power supply end, a second electrode of the fifth transistor is connected with a first electrode of the third transistor, and a control electrode of the fifth transistor is connected with a first light-emitting control line;
the second light emission control sub-circuit includes a sixth transistor;
a first electrode of the sixth transistor is connected to the second electrode of the third transistor, a second electrode of the sixth transistor is connected to the first electrode of the light emitting device, and a control electrode of the sixth transistor is connected to a second light emission control line;
the second reset sub-circuit comprises a seventh transistor;
a first electrode of the seventh transistor is connected with a first electrode of the light-emitting device, a second electrode of the seventh transistor is connected with a second initialization signal end, and a control electrode of the seventh transistor is connected with a second reset control signal line; the second electrode of the light-emitting device is connected with a second power supply end.
5. The pixel driving circuit according to claim 4, wherein the eighth transistor is connected between the seventh transistor and the light emitting device;
alternatively, the eighth transistor is connected between the sixth transistor and the seventh transistor.
6. A pixel driving method of the pixel driving circuit according to any one of claims 1 to 5, comprising:
an initialization stage, responding to a first reset control signal, and resetting the voltage of the control end of the driving sub-circuit through the first initialization signal;
a data writing stage, responding to a first scanning signal, transmitting a data voltage signal to a first end of a driving sub-circuit, responding to a second scanning signal, compensating the threshold voltage of the driving sub-circuit, and storing the data voltage signal;
a light emitting stage for providing a driving current for the light emitting device according to the voltages of the first end and the control end;
it is characterized by also comprising: in the light-emitting stage, responding to a third scanning signal, and providing a compensation driving current for the light-emitting device according to a temperature control signal;
further comprising: establishing and storing a first mapping relation table and/or a second mapping relation table;
in the light emitting stage, sensing the external environment temperature, and searching the corresponding temperature control signal from the first mapping relation table and/or the second mapping relation table according to the external environment temperature;
providing the searched temperature control signal to an eighth transistor;
the first mapping relation table is a mapping relation between different temperatures and potential differences between a first pole and a second pole of the corresponding eighth transistor under saturation current when the light-emitting device emits light with set light intensity at different temperatures;
the second mapping relation table is a mapping relation between different data voltage signals and a potential difference between the first pole and the second pole of the corresponding eighth transistor under the saturation current when the light emitting device emits light with set light intensity under different data voltage signals.
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